Bottled Ooze is an awesome idea, but it's a pretty terrible discovery. The low CR restriction is bad. Worse, you don't control the ooze, and can only throw it out to a range of 30ft. It's nice that you decide when and where the ooze appears, but it makes the tactical applications pretty limited. At worst, you've just added another monster to the encounter (that you won't get XP for).
My argument against a buff is only that the discovery needs a revision first. Pathfinder deliberately revised all 3.5 abilities that allowed you to become a monster for a reason. Writers don't intend for their monsters to be used by the players, so you can end up with some unbalanced options (such creatures that create spawn). Which is probably why they were so conservative with the CR.
I'd change the range to 20ft, but treat it as a thrown weapon (5 range increments), let the alchemist mentally compel the ooze as a move action, and make a specific list of oozes for each extract level. Though if you were feeling more ambitious, you could homebrew an ooze that scales with level, and even give it a list selectable abilities (similar to an eidolon).